C#实现根据图片的链接地址获取图片的后缀名

Ophelia ·

更新时间:2024-11-10

· 1531 次阅读

某天一朋友突然发来一个地址，问我怎么获取这张图片的后缀名？？

将代码放在下面以供参考：

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Net;
namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            var imgUrl = "http://emoji.qpic.cn/wx_emoji/haiannhLHhY7B1tX6eZ2BGNh9kzx3VCQ2MJfSQkSgE47sEXofVVoPCiaZKYbPcyQhS/";
            var imgByte = GetBytesFromUrl(imgUrl);
            if (imgByte.Length > 0)
            {
                var image = BytesToImage(imgByte);
                if (image != null)
                {
                    var mimeType = GetMimeType(image);
                    if (!string.IsNullOrEmpty(mimeType))
                    {
                        var fileName = AppDomain.CurrentDomain.BaseDirectory + "\\imgses\\" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + "." + mimeType;
                        CreateImageFromBytes(fileName, imgByte);
                    }
                }
            }
        }
        /// <summary>
        /// 将http路径图片转为byte字节数据
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static byte[] GetBytesFromUrl(string url)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            byte[] bytes;
            using (Stream stream = request.GetResponse().GetResponseStream())
            {
                using (MemoryStream mstream = new MemoryStream())
                {
                    int count = 0;
                    byte[] buffer = new byte[1024];
                    int readNum = 0;
                    while ((readNum = stream.Read(buffer, 0, 1024)) > 0)
                    {
                        count = count + readNum;
                        mstream.Write(buffer, 0, readNum);
                    }
                    mstream.Position = 0;
                    using (BinaryReader br = new BinaryReader(mstream))
                    {
                        bytes = br.ReadBytes(count);
                    }
                }
            }
            return bytes;
        }
        /// <summary>
        /// 将byte字节数据转为Image图片
        /// </summary>
        /// <param name="bytes">字节数组</param>
        /// <returns>图片</returns>
        public static Image BytesToImage(byte[] bytes)
        {
            Image image = null;
            using (MemoryStream ms = new MemoryStream(bytes))
            {
                ms.Write(bytes, 0, bytes.Length);
                image = Image.FromStream(ms, true);
            }
            return image;
        }
        /// <summary>
        /// 将Image图片转为byte字节数据
        /// </summary>
        /// <param name="image"></param>
        /// <returns></returns>
        public static byte[] ImageToBytes(Image image)
        {
            byte[] bt = null;
            if (!image.Equals(null))
            {
                using (MemoryStream mostream = new MemoryStream())
                {
                    Bitmap bmp = new Bitmap(image);
                    bmp.Save(mostream, ImageFormat.Bmp);//将图像以指定的格式存入缓存内存流
                    bt = new byte[mostream.Length];
                    mostream.Position = 0;//设置留的初始位置
                    mostream.Read(bt, 0, Convert.ToInt32(bt.Length));
                }
            }
            return bt;
        }
        /// <summary>
        /// 根据Image图片获取图片类型
        /// </summary>
        /// <param name="image"></param>
        /// <returns></returns>
        public static string GetMimeType(Image image)
        {
            var mimeType = "";
            var ImageCodec = ImageCodecInfo.GetImageDecoders();
            foreach (var item in ImageCodec)
            {
                if (item.FormatID == image.RawFormat.Guid)
                {
                    mimeType = item.MimeType.Split('/')[1];
                    break;
                }
            }
            return mimeType;
        }
        /// <summary>
        /// 将byte[]图片保存到指定文件
        /// </summary>
        /// <param name="fileName">保存的完整路径（包含文件名）</param>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public static void CreateImageFromBytes(string fileName, byte[] bytes)
        {
            string file = fileName;
            FileInfo info = new FileInfo(fileName);
            Directory.CreateDirectory(info.Directory.FullName);
            File.WriteAllBytes(file, bytes);
        }
    }
}

到此这篇关于C#实现根据图片的链接地址获取图片的后缀名的文章就介绍到这了,更多相关C#获取图片后缀名内容请搜索软件开发网以前的文章或继续浏览下面的相关文章希望大家以后多多支持软件开发网！

C# 图片地址

1024 个赞